For helicopters, Special Hobby do a good FA-223 Drache in 1/48, which makes for a very passable small transport heli, while the Japanese 'Death Ray', being an offshoot of radar tech (initially many nations, UK included, thought that radar could be used as a 'death ray', with technicians during early tests finding that the equipment had the side effect of heating the tea in the tin cups that they'd left near the gear) any radar dish - like model could be used to represent it.